Radiation-curable polymer

Abstract

The invention relates to a polymer having at least one group derived from a carboxylic ester of a hydroxyalkylamide and an α,β-ethylenically unsaturated carboxylic acid and a radiation curable composition comprising this polymer. A coating composition comprising this composition has a high rate of polymerisation and results in coatings having the desired chemical and mechanical properties.

1 . A radiation curable coating composition comprising a polymer having formula (I):  
                   
       where: 
 P=a polymrer group,  
 Y=hydrogen, an (C 1 -C 8 ) alkyl group or a group of the formula  
                 

 R 1 , R 2 , R 3 , R 4  are, identical or different, hydrogen or a lineair, branched or cyclic (C 1 -C 8 ) alkyl chain,  
 R 5 =hydrogen, (C 1 -C 5 )alkyl, —CH 2 OH or CH 2 COOX,  
 R 6 , R 7 =hydrogen, (C 1 -C 8 ) alkyl, or COOX,  
 X=hydrogen or (C 1 -C 8 ) alkyl,  
 n=1-100 and  
 m=1-4.  
 
 
     
     
         2 . A composition according to    claim 1   , characterized in that Y is hydrogen or methyl, R 1 , R 2 , R 3  and R 4  are hydrogen or methyl, R 5  is hydrogen or (m)ethyl and R 6  and R 7  are hydrogen.  
     
     
         3 . A coating obtained by radiation curing of a composition according to any one of claims  1 - 2 .  
     
     
         4 . An entirely or partly coated substrate wherein a coating according to    claim 3    is applied as the coating.